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=pod

=head1 NAME

BN_mod_inverse - compute inverse modulo n

=head1 SYNOPSIS

 #include <openssl/bn.h>

 BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
                        BN_CTX *ctx);

=head1 DESCRIPTION

BN_mod_inverse() computes the inverse of B<a> modulo B<n>
places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL,
a new B<BIGNUM> is created.

B<ctx> is a previously allocated B<BN_CTX> used for temporary
variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>.

=head1 RETURN VALUES

BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and
NULL on error. The error codes can be obtained by L<ERR_get_error(3)>.

=head1 SEE ALSO

L<ERR_get_error(3)>, L<BN_add(3)>

=head1 COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut